CN116412264A - Valve - Google Patents

Abstract

The invention discloses a valve, which comprises a valve rod, a valve body assembly and a valve core, wherein the valve body assembly is provided with an inlet and an outlet; the valve body assembly is provided with a through hole, a plurality of first sealing elements which are spaced along the axial direction of the valve rod are arranged between the valve rod and the wall of the hole corresponding to the through hole, and two adjacent first sealing elements are enclosed with the valve rod and the wall of the inner hole of the through hole to form a sealing gap; the valve rod is provided with the blind hole, and the blind hole is close to the one end of case to the other end extension from the valve rod, and the open end seal of blind hole is provided with the vary voltage part, and the open end can be linked together with the import, and vary voltage part encloses with the hole wall of blind hole and closes and form and hold the chamber, and the vary voltage part includes the elastic membrane, and the part of elastic membrane can be to holding the chamber motion so that hold the volume in chamber and diminish, and the valve rod still is provided with the intercommunication and holds the intercommunicating pore in chamber and sealed clearance, holds chamber, intercommunicating pore and sealed clearance in the packing have the sealing fluid. Improving the sealing performance of the valve.

Description

Valve

Technical Field

The invention relates to the technical field of fluid control, in particular to a valve.

Background

Valves are a common component in fluid medium piping systems for switching on and off a fluid medium.

The valve comprises a control device, a valve rod, a valve body assembly and a valve core, wherein the valve core is positioned in an inner cavity formed by the valve body assembly, and the control device drives the valve core to rotate by rotating the valve rod, so that the functions of switching on and off fluid media or switching fluid media are achieved. However, in order to prevent the fluid medium from leaking outwards in the axial direction of the valve stem during operation of the valve, the sealing performance of the sealing ring in the axial direction of the valve stem is required to be high, especially when high-pressure fluid medium is involved.

Disclosure of Invention

The invention aims to provide a valve capable of improving the sealing performance of the valve.

In order to solve the technical problems, the invention provides a valve, which comprises a valve rod, a valve body assembly and a valve core, wherein the valve body assembly is provided with an inlet and an outlet, the valve core is arranged in the valve body assembly, the valve rod is connected with the valve core, the valve body assembly is provided with a through hole, the valve rod part is positioned in the through hole, a plurality of first sealing elements which are spaced along the axial direction of the valve rod are arranged between the valve rod and the wall of the hole corresponding to the through hole, and two adjacent first sealing elements are enclosed with the valve rod and the wall of the hole corresponding to the through hole to form a sealing gap; the valve rod is provided with the blind hole, the blind hole is followed the valve rod is close to the one end of case extends to the other end, the sealed pressure varying part that is provided with of open end of blind hole, open end can with the import is linked together, pressure varying part with the pore wall that the blind hole corresponds encloses and closes and form and hold the chamber, the valve rod still is provided with the intercommunication hold the chamber with seal gap's intercommunicating pore, hold the chamber communication pore and seal gap is filled with the sealing fluid in, pressure varying part includes the elastic membrane, the part of elastic membrane can to hold the chamber motion so that hold the volume in chamber diminish.

The utility model provides a valve, includes a plurality of first sealing members of axial looks spaced along the valve rod, adjacent two first sealing member encloses with the valve rod, the pore wall that passes the hole and closes and form sealed clearance, the valve rod is provided with the blind hole, the opening tip seal of blind hole is provided with the vary voltage part, the vary voltage part encloses with the pore wall that the blind hole corresponds and closes and form and hold the chamber, sealed clearance and hold the chamber intercommunication, hold the chamber and fill in the sealed clearance and have the sealing fluid, the part of the elastic membrane of vary voltage part can be to holding the chamber motion so that hold the volume in chamber diminish, in order to form the sealing performance that the liquid seal improves the valve in sealed clearance.

Drawings

FIG. 1 is a split block diagram of one embodiment of a valve provided by the present invention;

FIG. 2 is a cross-sectional view of a valve provided by the present invention;

FIG. 3 is a diagram of the connection of a valve stem to a dynamic seal mechanism;

FIG. 4 is a schematic diagram of the structure of the transformer component;

FIG. 5 is a schematic view of the shaft seal seat;

FIG. 6 is a schematic view of the structure of the first valve cover;

FIG. 7 is a schematic structural view of a second valve cover;

FIG. 8 is a schematic structural view of a valve stem;

fig. 9 is a schematic structural view of the valve core.

The reference numerals in fig. 1-9 are illustrated as follows:

1 valve rod, 11 blind holes, 12 communication holes, 13 expansion grooves, 14 first limit protrusions, 141 pad parts,

15 second limit protrusions;

the valve comprises a valve body assembly, a valve body 211a inlet, a valve cover 212, a valve body 212a outlet, a 22 dynamic sealing mechanism, a 221 first end cover, a 221a first hole, a 221b first mounting groove, a 221c limiting mounting hole, a 221d corner limiting component, a 222 shaft seal seat, a 222a second hole, a 222a-1 small-diameter hole section, a 222a-2 large-diameter hole section, a 222b protruding part, a 223 second end cover, a 223a third hole and a 223b second mounting groove;

3, a valve core, a 31 first communication channel and a 32 second communication channel;

4 a pressure changing component, a 41 seat body, a 411 body part, a 411a flow hole, a 411b body groove and a 411c supporting part, 412 mounting a protruding part, a 42 elastic die and a 43 second sealing piece;

5 a first seal;

6 inner seal assembly, 61 seal ring plate, 62 third seal;

7 a control part, 71 a transmission mechanism;

a is used for sealing the gap and B is used for accommodating the cavity.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

The term "plurality" as used herein refers to a plurality, typically two or more, of indefinite quantities; and when "a number" is used to denote the number of a certain number of components, the number of components is not necessarily related to each other.

The terms "first," "second," and the like, herein are merely used for convenience in describing two or more structures or components that are identical or functionally similar, and do not denote any particular limitation of order and/or importance.

Referring to fig. 1 to 9, fig. 1 is a split structure diagram of a valve according to an embodiment of the present invention, fig. 2 is a cross-sectional view of the valve according to the present invention, fig. 3 is a connection structure diagram of a valve rod and a dynamic seal mechanism, fig. 4 is a schematic structure diagram of a variable pressure component, fig. 5 is a schematic structure diagram of a shaft seal seat, fig. 6 is a schematic structure diagram of a first valve cover, fig. 7 is a schematic structure diagram of a second valve cover, fig. 8 is a schematic structure diagram of a valve rod, and fig. 9 is a schematic structure diagram of a valve core.

As shown in fig. 1 and 2, the present invention provides a valve that can be applied to a heat pump system, an air conditioning system, or other flow path circulation system of a vehicle to realize on-off or switching of a fluid medium.

The valve comprises a valve rod 1, a valve body assembly 2 and a valve core 3, wherein the valve body assembly 2 is provided with an inlet 211a and an outlet 212a, the valve core 3 is arranged in the valve body assembly 2, and the valve rod 1 is connected with the valve core 3 and used for controlling the valve core 3 to rotate in an inner cavity. When the spool 3 rotates to such an extent that the valve is in the valve-closing state, the inlet 211a and the outlet 212a cannot be conducted; and when the valve core 3 rotates to make the valve in the valve-opening state, the inlet 211a and the outlet 212a can be conducted; meanwhile, in the valve opening state, the opening degree of the valve can be adjusted by adjusting the rotating position of the valve core 3 so as to meet different flow requirements.

The valve provided by the invention can be a manual valve, and at the moment, the on-off adjustment or the opening adjustment of the valve can be realized in a manual operation mode. In this mode of operation, the valve structure can be relatively simple.

In some embodiments, the valve stem 1 may have an operating end portion extending out of the valve body assembly 2, and the cross-section of the operating end portion perpendicular to the axial direction may be hexagonal, quadrangular, or the like, to facilitate an operator's rotation of the valve stem 1 by means of an operating tool in the form of a wrench or the like. In other embodiments, the end of the valve stem 1 extending from the valve body assembly 2 may also be provided with an operating handle through which an operator may directly actuate the valve stem 1 in use; the specific structural form of the operating handle is not limited herein.

Alternatively, the valve provided by the present invention may be an automatic valve, and in this case, the valve may further include a control unit 7. A driving mechanism (not shown) can be arranged in the control part 7, and the driving mechanism can be in transmission connection with the valve rod 1 and is used for driving the valve core 3 to automatically rotate so as to relatively simply and laborsaving complete the switching of the valve in use state.

The kind of the driving mechanism is not limited here, as long as the corresponding technical effects can be achieved. For example, the drive mechanism may be a hydraulic mechanism, a pneumatic mechanism, or an electric mechanism. Taking an electric mechanism as a specific example, the electric mechanism may include a motor that may be directly connected to the valve stem 1 to directly transmit rotational torque to the valve stem 1; or, a transmission mechanism 71 may be disposed between the motor and the valve rod 1, the transmission mechanism 71 may be a gear mechanism, a pulley mechanism, a sprocket mechanism, or the like, at least a part of the transmission mechanism 71 may be located inside the control part 7, the control part 7 may be in transmission connection with the valve rod 1 through the transmission mechanism 71, and the rotation torque output by the motor may be greatly increased by disposing the transmission mechanism 71, so as to meet the driving requirement.

The valve body assembly 2 has a through hole (not shown), and the valve stem 1 is partially located in the through hole, from which the valve stem 1 can pass and partially protrude out of the valve body assembly 2. In conventional solutions, the sealing between the valve stem 1 and the through hole is only provided by the provision of a sealing ring. However, the valve rod 1 needs to drive the valve core 3 to rotate during use, in order to reduce the rotation resistance, an excessive pressing force cannot be set between the sealing ring and the inner hole wall of the through hole and/or between the sealing ring and the valve rod 1, and in the case of high-pressure fluid media such as refrigerant media, leakage is easy to occur between the sealing ring and the valve rod 1 and/or between the sealing ring and the inner hole wall of the through hole.

For this reason, in the embodiment of the present invention, please continue to refer to fig. 2, and referring to fig. 3, a plurality of first sealing elements 5 are disposed between the valve rod 1 and the wall of the hole corresponding to the through hole, and the adjacent two first sealing elements 5 and the valve rod 1 and the wall of the hole corresponding to the through hole enclose a sealing gap a; the valve rod 1 is provided with a blind hole 11, the blind hole 11 extends from one end of the valve rod 1 close to the valve core 3 to the other end, and the opening end part of the blind hole 11 is provided with a pressure changing component 4 in a sealing way; the wall of the transformation part 4 corresponding to the blind hole 11 encloses to form a containing cavity B, the valve rod 1 is further provided with a communication hole 12 which is communicated with the containing cavity B and the sealing gap A, sealing liquid is filled in the containing cavity B, the communication hole 12 and the sealing gap A, the transformation part 4 can be contacted with fluid medium flowing in from the inlet 211a, the transformation part 4 comprises an elastic membrane 42, and part of the elastic membrane 42 can move towards the containing cavity B so that the volume of the containing cavity B is reduced.

In a specific application, the fluid medium flowing into the valve from the inlet 211a, especially the high-pressure fluid medium, can act on the elastic membrane 42, and the elastic membrane 42 can compress the volume of the accommodating cavity B, so that the sealing liquid in the accommodating cavity B can better enter the sealing gap a from the communication hole 12, so as to form a relatively uniform and stable liquid sealing film in the sealing gap a, and the liquid sealing film can form a multi-layer seal in cooperation with the first sealing elements 5 on two axial sides of the liquid sealing film, so that the sealing effect can be better ensured, and the leakage of the fluid medium in the axial direction of the valve rod 1 can be further limited.

Meanwhile, the sealing liquid in the sealing gap A can lubricate the first sealing element 5, so that friction loss between the valve rod 1 and the first sealing element 5 and/or between the first sealing element 5 and the inner hole wall of the through hole in the rotation process of the valve rod 1 is reduced, and the service life of the first sealing element 5 can be prolonged.

Here, the embodiment of the present invention is not limited to the kind of the sealing liquid, and in specific practice, a person skilled in the art may set the sealing liquid according to actual needs, so long as the sealing liquid can meet the use requirement; for example, the sealing liquid may be a refrigerant oil to exert sealing and lubricating effects better, and of course, as another embodiment, the sealing liquid may be another sealing medium. The choice of sealing fluid is matched to the fluid medium flowing through the valve, so that contamination of the fluid medium by the sealing fluid can be reduced.

Moreover, the embodiment of the present invention is not limited to the kind and shape of the first sealing member 5, and in specific practice, those skilled in the art can select according to actual needs, as long as the above-described effects can be achieved. As a preferred embodiment, the first seal 5 is an X-shaped seal, and the X-shape is not necessarily a standard X-shape, but may be substantially similar to the X-shape. The close contact area between the sealing element and the valve rod 1 and the close contact area between the sealing element and the wall of the hole passing through the inner wall of the hole can be smaller, so that the rotation resistance of the valve rod 1 can be reduced; and, compare in the sealing element that the cross-section is circular, can also avoid the roll of first sealing member 5 in the use better to guarantee the stability of first sealing member 5 in the use, this also has positive meaning to improving the sealing performance of first sealing member 5, is convenient for by the sealing liquid compression simultaneously, improves the force between the pore wall that first sealing member 5 and valve rod 1, pass the hole and correspond, improves sealing performance.

The number of first seals 5 provided is related to the number of seal gaps a. Assuming that the number of the first sealing members 5 is N, each of the first sealing members 5 is disposed at intervals in the axial direction, and one sealing gap a may be formed between two adjacent first sealing members 5, the number of the sealing gaps a may be N-1. It will be appreciated that the greater the number of first seals 5, the greater the number of sealing gaps a, and the better the axial sealing effect of the valve stem 1; the number of first seals 5 may be at least two, in which case the number of sealing gaps a may be one and the structure of the whole valve may be relatively simple.

The embodiment of the invention also does not limit the installation position of the transformer 4 in the blind hole 11. In some embodiments, a portion of the transformer component 4 may be positioned within the blind bore 11, and another portion of the transformer component 4 may extend out of the blind bore 11. In other embodiments, the transformer 4 may be entirely located within the blind bore 11, i.e., the transformer 4 may not have a portion exposed outside of the blind bore 11, such embodiments being particularly contemplated in fig. 3.

The whole transformer part 4 is in a static state in the blind hole 11, the seal between the transformer part 4 and the inner hole wall of the blind hole 11 is static seal, the sealing structure can be relatively simple, and the sealing reliability between the transformer part 4 and the inner hole wall of the blind hole 11 is easier to ensure.

In detail, referring to fig. 4, the transformer 4 may include a base 41 and an elastic membrane 42, the base 41 may be fixedly assembled at the opening end, the outer periphery of the elastic membrane 42 may be fixed or limited on a surface of the base 41 facing the accommodating cavity B, and in fig. 4, the elastic membrane 42 is specifically mounted on the upper surface of the base 41; the seat 41 may be provided with the ventilation holes 411a, and the shape and number of the ventilation holes 411a are not limited herein, and in specific practice, those skilled in the art may perform configuration according to actual needs, so long as the usage requirement can be satisfied; the flow hole 411a may communicate with the inlet 211a and may extend to a side of the seat body 41 facing the elastic membrane 42, i.e., the flow hole 411a may extend to an upper surface of the seat body 41 in fig. 4.

So set up, the fluid medium that flows in from the import 211a can act on the one side of elastic membrane 42 towards pedestal 41 through the circulation hole 411a to can drive the mid portion of elastic membrane 42 to bulge towards holding chamber B, and then can reduce holding chamber B's volume, so that the sealing fluid in holding chamber B can flow to seal clearance A.

In the above-described embodiment, the outer periphery of the elastic membrane 42 is fixedly connected to the base 41, so that the middle portion of the elastic membrane 42 may bulge under the action of the fluid medium. In practice, the fixing position of the elastic membrane 42 is not limited to the outer periphery, but may include other positions, such as a middle region, so long as the whole surface of the elastic membrane 42 is not fixedly connected with the base 41, so that the elastic membrane 42 may have a bulge under the action of the fluid medium, and the volume of the accommodating cavity B may be further reduced, so that the technical requirements of the embodiments of the present invention may be satisfied.

In the embodiment shown in fig. 4, the mating surface between the housing 41 and the elastic film 42 is a flat surface. In addition, the mating surface of the base 41 and the elastic membrane 42 may be spherical, arc cylindrical or other shaped surfaces.

The mounting manner of the seat 41 and the blind hole 11 may be a relatively non-detachable connection manner such as welding, bonding, etc., and at this time, after the seat 41 is fixed to the blind hole 11, the sealing connection between the seat 41 and the inner hole wall of the blind hole 11 may be synchronously realized. Or, the mounting mode of the seat 41 and the blind hole 11 can be a connection mode of threaded connection, clamping connection and the like which are relatively easy to disassemble, so as to facilitate the disassembly, assembly and maintenance of the transformer component 4; in this embodiment, a second seal 43 in the form of a sealing ring or the like can also be added between the housing 41 and the blind hole 11 for achieving a sealing arrangement between the housing 41 and the blind hole 11. The material of the second sealing member 43 may be a rubber material with a certain elasticity, so as to ensure sealing performance.

Take as an example a specific relatively easy to disassemble connection. The seat body 41 may include a body portion 411 and a mounting boss 412, and the mounting boss 412 may be located at an outer wall surface of the body portion 411; in fig. 4, the mounting boss 412 is specifically located at one axial end of the body 411, and of course, it may be disposed at other axial positions of the body 411; the flow hole 411a and the elastic film 42 may be provided in the body 411; the open end of the blind hole 11 may be provided with a circumferentially extending catch groove (not shown) and an axially extending slide groove (not shown) which may be in communication with the catch groove. In the specific assembly, the seat 41 may first slide into the opening end along the sliding groove with the mounting boss 412 to the position where the sliding groove is in communication with the clamping groove, and then the seat 41 may be rotated in the circumferential direction, so that the mounting boss 412 may slide into the clamping groove, and thus the axial mounting position of the seat 41 in the blind hole 11 may be determined.

In this embodiment, the seat 41 may be integrally located inside the blind hole 11, and the flow hole 411a provided in the seat 41 may also serve as an operation hole to facilitate insertion of an installation tool, so that the seat 41 may be conveniently rotated.

The outer peripheral wall of the body portion 411 may be provided with a body groove 411b for mounting the aforementioned second seal 43. In fact, the mounting of the second seal 43 is not limited to the above-described form, and the body recess 411b may be provided in the inner hole wall of the blind hole 11, or in both the inner hole wall of the blind hole 11 and the outer peripheral wall of the body 411, as is also possible.

Referring to fig. 4, the body portion 411 includes a supporting portion 411c, the supporting portion 411c is located on a side of the elastic membrane 42 near the valve core 3, and a non-fixedly connected area of the elastic membrane 42 may be abutted against the supporting portion 411c, for example, the body portion 411 is provided with a plurality of through holes, and the supporting portion 411c is formed between the through holes 411a, so as to improve the service life of the elastic membrane 42 and the sealing performance of the valve.

Further, as also shown in fig. 3, the outer peripheral wall of the valve stem 1 may be further provided with a capacity expansion groove 13, the capacity expansion groove 13 being located between two adjacent first seals 5, and the capacity expansion groove 13 may be in communication with the communication hole 12. The radial dimension of the sealing gap A can be increased by the arrangement of the capacity expansion groove 13 to form a liquid storage buffer area, so that the sealing liquid is uniformly distributed in the sealing gap A, and a more stable and uniform liquid sealing film can be formed to improve the sealing effect.

In particular practice, it is also possible to make the radial dimensions of the sealing gap a the same at each axial position.

With continued reference to fig. 2, the valve body assembly 2 may include a valve body 21, the valve body 21 being configured to form the main body structure of the valve and to form the receiving chamber of the valve core 3.

To facilitate assembly of the valve core 3, the valve body 21 may include a separate valve body 211 and a valve cover 212, and the valve cover 212 may be mounted to the valve body 211. The mounting manner between the valve cover 212 and the valve body 211 may be relatively non-detachable welding, bonding, etc., at which time the sealing arrangement between the valve body 211 and the valve cover 212 may also be achieved synchronously. Alternatively, the mounting manner between the valve cover 212 and the valve body 211 may be a threaded connection, a clamping connection, etc. which are relatively easy to disassemble; in the embodiment of fig. 2, the valve cover 212 and the valve body 211 may be screw-coupled, and in this case, a sealing member in the form of a sealing ring or the like may be further provided between the valve cover 212 and the valve body 211 for securing sealing performance between the valve cover 212 and the valve body 211.

One of the valve body 211 and the valve cover 212 is formed with an inlet passage, and the other of the valve body 211 and the valve cover 212 is formed with an outlet passage. In the embodiment of fig. 2, an inlet passage may be provided to the valve body 211, and an end of the inlet passage remote from the valve cartridge 3 may form an inlet 211a; an outlet passage may be provided in the valve cover 212, and an end of the outlet passage remote from the valve core 3 may form an outlet 212a.

The aforementioned through hole may be provided directly to the valve body 21, for example, may be provided to the valve body 211. At this time, both the first seal 5 and the seal gap a may exist between the valve body 21 and the valve stem 1, the number of newly added structural members is relatively small, and the structure of the entire valve may be relatively simple.

In particular, as shown in fig. 2 and 3, the valve may further be provided with a dynamic sealing mechanism 22, and the valve body 21 may be provided with a mounting hole (not labeled in the drawings), and the dynamic sealing mechanism 22 may be sealingly assembled in the mounting hole, and the aforementioned through hole may be provided in the dynamic sealing mechanism 22. So arranged, during assembly, the dynamic seal mechanism 22 and the valve rod 1 can be assembled externally to facilitate the installation of the first seal 5; then, the assembly formed by combining the dynamic sealing mechanism 22 and the valve rod 1 is assembled with the valve body 21, so that the assembly can be simpler.

The seal between the dynamic seal mechanism 22 and the valve body 21 is a static seal, which is relatively easy. In specific practice, the dynamic sealing mechanism 22 and the valve body 21 can be sealed by a sealing element in the form of a sealing ring; alternatively, the dynamic seal mechanism 22 and the valve body 21 may be sealed by welding or bonding.

Further, in a direction approaching the valve body 21, the dynamic seal mechanism 22 may include a first end cap 221, a shaft seal seat 222, and a second end cap 223 in sequence, the number of the first seal members 5 may be two, and two first seal members 5 may be disposed between the first end cap 221 and the shaft seal seat 222, and between the second end cap 223 and the shaft seal seat 222, respectively. In this way, the ease of installation of the two first seals 5 can be greatly improved; meanwhile, the sealing gap A only exists between the shaft seal seat 222 and the valve rod 1, and is not separated in the axial direction, so that the tightness of the sealing gap A is ensured.

Referring to fig. 5 to 7, the passing holes may include a first hole 221a provided to the first end cap 221, a second hole 222a provided to the shaft seal seat 222, and a third hole 223a provided to the second end cap 223, and the valve stem 1 may pass through the first hole 221a, the second hole 222a, and the third hole 223a in this order in a direction approaching the valve body 3. The second hole 222a may include a small-diameter hole section 222a-1 and large-diameter hole sections 222a-2 at both axial ends of the small-diameter hole section 222a-1, and two first seals 5 may be disposed at the two large-diameter hole sections 222a-2 in one-to-one correspondence.

It will be appreciated that the first and third apertures 221a, 223a may also include large diameter aperture sections 222a-2, that is, the first seal 5 may in fact be wholly or partially mounted to the first and third apertures 221a, 223a as well. In addition, the above-described manner is that the first seal member 5 is accommodated in the dynamic seal mechanism 22, and in fact, it is also possible to provide a ring groove in the outer wall of the valve stem 1 for mounting the first seal member 5.

Here, the embodiment of the present invention is not limited to the mounting manner of the first end cover 221, the shaft seal seat 222, and the second end cover 223, and in specific practice, those skilled in the art may set the mounting manner according to actual needs, so long as the requirement of connection reliability can be satisfied. For example, the three parts can be connected by adopting a connecting mode such as welding, bonding, threaded connection (direct threaded connection or connection by arranging a threaded connecting piece), clamping connection and the like.

In the embodiment of the drawings, an end of the first end cap 221 facing the shaft seal seat 222 may be provided with a first mounting groove 221b, and the first mounting groove 221b may communicate with the first hole 221 a; the end of the second end cap 223 facing the shaft seal seat 222 may be provided with a second mounting groove 223b, and the second mounting groove 223b may communicate with the third hole 223a. The shaft seal seat 222 may be mounted to the first mounting groove 221b and the second mounting groove 223b in one-to-one correspondence at both axial ends, and the specific mounting manner may be interference press-fitting.

In detail, as shown in fig. 5, both axial ends of the shaft seal seat 222 may be provided with protruding portions 222b, and the two protruding portions 222b may be fitted in the first and second mounting grooves 221b and 223b in one-to-one correspondence. The two large-diameter hole segments 222a-2 of the second hole 222a may be disposed in one-to-one correspondence with the two protrusions 222b.

Further, the end of the valve rod 1 near the valve core 3 may be provided with a first limiting protrusion 14, where the first limiting protrusion 14 can directly or indirectly abut against the end of the dynamic sealing mechanism 22 near the valve body 21 in the axial direction, so as to limit the axial movement of the valve rod 1 away from the valve core 3.

The direct abutment here means that no intermediate component is provided between the first limiting protrusion 14 and the dynamic seal mechanism 22 (specifically, the second end cover 223), and the first limiting protrusion 14 may directly contact with the dynamic seal mechanism 22 along the axial direction. The indirect abutment here means that an intermediate component, such as a pad 141, is disposed between the first limiting protrusion 14 and the dynamic sealing mechanism 22 (specifically, the second end cover 223), and the first limiting protrusion 14 may contact the dynamic sealing mechanism 22 through the intermediate component; the intermediate member can reduce wear of the first limiting boss 14 and the dynamic seal mechanism 22, and can improve the service lives of the valve stem 1 and the dynamic seal mechanism 22.

Further, the end of the valve rod 1 far away from the valve core 3 may be further provided with a second limiting protrusion 15, where the second limiting protrusion 15 can directly or indirectly abut against the end of the dynamic sealing mechanism 22 far away from the valve body 21 in the axial direction, so as to limit the axial movement of the valve rod 1 towards the valve core 3. In the embodiment of the figures, as shown in fig. 3, the second limit projection 15 is in particular in direct or indirect abutting engagement with the first end cap 221.

One of the first and second limit protrusions 14 and 15 may be integrally formed with the valve stem 1. Alternatively, the first limiting protrusion 14 and the second limiting protrusion 15 may be in a split structure with the valve rod 1, so as to adjust the installation positions of the two limiting protrusions on the valve rod 1, and facilitate the assembly of the valve rod 1 in the dynamic sealing mechanism 22.

For the second limiting protrusion 15, a transmission tooth and other components can be integrated on the outer wall of the second limiting protrusion, so that the control component can be in transmission connection. Meanwhile, the second limiting protrusion 15 can also have the function of steering limiting, at this time, the valve body assembly 2 can be further provided with a corner limiting component 221d, and the second limiting protrusion 15 is further used for being abutted with the corner limiting component 221d along the circumferential direction, so that the rotating angle of the valve rod 1 can be limited, and the working state of the valve provided by the invention can be accurately adjusted.

Therefore, the second limiting protrusion 15 can have the functions of axial limiting, circumferential limiting and transmission connection, and is beneficial to reducing the number of parts so as to simplify the structure of the valve provided by the invention. Of course, the three functions of axial limit, circumferential limit and drive connection may also correspond to the three components, respectively, which is also possible in specific practice.

The mounting position of the rotation angle restricting member 221d is not limited as long as the above-described technical effects can be achieved. In the solution of the drawings, as shown in fig. 3 and 6, the corner limiting component 221d may be mounted on the first end cover 221, and a specific mounting manner may be welding, bonding, screwing, clamping, riveting, etc.; as an exemplary illustration, the first end cap 221 may be provided with a limit mounting hole 221c, and the rotation angle limiting part 221d may be fixed to the limit mounting hole 221c by screwing.

The embodiment of the invention is also not limited to the structural form of the valve core 3, which is also associated with the kind of valve in particular.

In the embodiment of fig. 2, the valve core 3 may be a ball type, and in this case, the valve provided by the present invention may be a ball valve. The valve body 3 is provided with a first communication passage 31 capable of communicating the inlet 211a and the outlet 212a, and is also provided with a second communication passage 32 communicating the open end and the first communication passage 31, and the valve stem 1 can be mounted to the second communication passage 32. In this way, in the valve-opened state, the fluid medium flowing in from the inlet 211a can enter the second communication passage 32 after entering the first communication passage 31, and act on the pressure changing member 4.

The connection manner of the valve stem 1 and the second communication passage 32 is not limited as long as reliable connection of the valve stem 1 and the valve element 3 can be ensured; for example, various connection modes such as welding, bonding, interference fit, threaded connection and the like can be adopted between the two. In practice, the valve stem 1 may not be inserted into the second communication channel 32, and may be directly mounted on the surface of the valve core 3, as long as it is possible to implement that the fluid medium in the second communication channel 32 can act on the pressure changing member 4.

Further, an internal sealing assembly 6 may be included for sealing the valve core 3 and the inner chamber wall of the valve body assembly 2. In this way, in the valve-open state, the fluid medium can only communicate the inlet 211a and the outlet 212a through the first communication channel 31, so as to accurately regulate and control the flow rate of the fluid medium; in the valve-closed state, a reliable blocking of the inlet 211a and the outlet 212a can be achieved.

The internal seal assembly 6 may have various designs as long as the above-described sealing effect can be satisfied, and for example, the internal seal assembly 6 may employ a sealing member in the form of a gasket, a seal ring, or the like.

In particular to the embodiment of the drawings, as also shown in fig. 2, the inner seal assembly 6 may comprise a seal ring plate 61 and a third seal 62, one end of the third seal 62 may abut against the inner cavity wall of the valve body assembly 2, the other end of the third seal 62 may abut against the seal ring plate 61, and the seal ring plate 61 is in contact with the outer wall of the valve cartridge 3.

With this design, on the one hand, it is advantageous to prevent leakage of the fluid medium from the fitting gap between the valve spools 3 of the valve body 211 and/or the fitting gap between the valve cover 212 and the valve spools 3; on the other hand, the third sealing member 62 is also beneficial to compensating the abrasion gap of the sealing ring plate 61 caused by frequent relative rotation with the valve core 3, so that the valve body 211, the valve cover 212 and the valve core 3 can still ensure relatively good sealing performance under long-time operation.

The third sealing member 62 may be an elastic body made of an elastic material having a certain elasticity, such as a rubber ring. The sealing ring plate 61 may be made of a wear-resistant material, so as to improve the wear resistance of the sealing ring plate 61.

The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims (10)

1. The valve comprises a valve rod (1), a valve body assembly (2) and a valve core (3), wherein the valve body assembly (2) is provided with an inlet (211 a) and an outlet (212 a), the valve core (3) is arranged in the valve body assembly (2), and the valve rod (1) is connected with the valve core (3), and the valve is characterized in that the valve body assembly (2) is provided with a through hole, the valve rod (1) is partially positioned in the through hole, a plurality of first sealing pieces (5) which are spaced along the axial direction of the valve rod (1) are arranged between the valve rod (1) and the wall of the through hole, and the adjacent two first sealing pieces (5) are enclosed with the valve rod (1) and the wall of the through hole to form a sealing gap (A);

the valve rod (1) is provided with blind hole (11), blind hole (11) are followed valve rod (1) is close to the one end of case (3) is extended to the other end, the sealed pressure varying part (4) that is provided with of open end of blind hole (11), open end can with import (211 a) are linked together, pressure varying part (4) with the pore wall that blind hole (11) corresponds encloses and closes and form and hold chamber (B), valve rod (1) still is provided with the intercommunication hold chamber (B) with communication hole (12) of sealed clearance (A), hold chamber (B) communication hole (12) and be filled with the sealing fluid in sealed clearance (A), pressure varying part (4) include elastic membrane (42), the part of elastic membrane (42) can to hold chamber (B) motion so that hold the volume of chamber (B) diminish.

2. Valve according to claim 1, characterized in that the pressure-transforming part (4) comprises a seat (41), the seat (41) being fixed or constrained to the open end, the elastic membrane (42) having a fixed zone and a non-fixed zone, the fixed zone being fixed to the side of the seat (41) facing the containing chamber (B);

the seat body (41) is provided with a flow hole (411 a), and the flow hole (411 a) is communicated with the inlet (211 a) and can extend to the face of the seat body (41) facing the non-fixedly connected area.

3. The valve according to claim 2, characterized in that the seat body (41) comprises a body portion (411), the flow hole (411 a) and the elastic membrane (42) are both provided in the body portion (411), the body portion (411) comprises a support portion (411 c), the support portion (411 c) is located at a side of the elastic membrane (42) close to the valve core (3), and the non-fixedly connected region of the elastic membrane (42) can be abutted with the support portion (411 c).

4. A valve according to claim 3, wherein the seat body (41) includes a mounting boss (412), the mounting boss (412) is located on an outer wall surface of the body portion (411), the opening end portion is provided with a circumferentially extending locking groove and an axially extending sliding groove, the sliding groove is communicated with the locking groove, and the mounting boss (412) can slide into the opening end portion from the sliding groove and be locked in the locking groove.

5. Valve according to claim 4, characterized in that a second seal (43) is provided between the inner bore wall of the open end and the body part (411).

6. Valve according to any of claims 1-5, characterized in that the outer circumferential wall of the valve stem (1) is provided with a expansion groove (13), the expansion groove (13) being located between two adjacent first seals (5), the expansion groove (13) being in communication with the communication hole (12).

7. Valve according to claim 6, characterized in that the first seal (5) is an X-seal.

8. Valve according to claim 6, characterized in that the valve body assembly (2) comprises a valve body (21) and a dynamic sealing mechanism (22), the valve body (21) being provided with a mounting hole, the dynamic sealing mechanism (22) being sealingly fitted to the mounting hole, the dynamic sealing mechanism (22) being provided with the through hole.

9. The valve according to claim 8, characterized in that the dynamic sealing mechanism (22) comprises, in a direction approaching the valve body (21), a first end cap (221), a shaft seal seat (222) and a second end cap (223), the number of the first sealing elements (5) being two, wherein one of the first sealing elements (5) is arranged between the first end cap (221) and the shaft seal seat (222), and the other of the first sealing elements (5) is arranged between the second end cap (223) and the shaft seal seat (222).

10. The valve according to claim 9, wherein the through hole comprises a first hole (221 a) formed in the first end cap (221), a second hole (222 a) formed in the shaft seal seat (222), and a third hole (223 a) formed in the second end cap (223), the second hole (222 a) comprises a small-diameter hole section (222 a-1) and large-diameter hole sections (222 a-2) formed at both axial ends of the small-diameter hole section (222 a-1), and the two first seals (5) are formed at the two large-diameter hole sections (222 a-2) in a one-to-one correspondence.

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